Zojirushi SM-SF48 Stainless Steel Mug Review: Would Owners Buy It Again?
Disclosure: As an Amazon Associate I earn from qualifying purchases. If you buy through links on this page we may earn a commission at no extra cost to you. How this review was made: We did not test this mug in person. This verdict is based on our analysis of expert tests and owner themes, all listed at the end of this article. Some of the tests we cite covered other Zojirushi mugs of the same family, and we say so where it matters. Our method.
One of the best at keeping drinks hot, if you do not mind hand washing
Consumer Reports found a 16 oz Zojirushi mug kept liquid hot for about thirteen and a half hours, roughly double the Thermos Stainless King, and a separate comparison saw no leaks when shaken, tipped or inverted. The costs are a lid that comes apart into several pieces that need hand washing, a slow flow rate and a tall, narrow shape. For most commuters who want hot coffee to stay hot, owners and testers point to it as a mug worth buying again.
Check current price on Amazon → Prices and availability change often, so we don't list them here.Buy it again if you…
- want coffee or tea to stay hot for many hours
- need a lid that locks and resists spills in a bag or cup holder
- are happy to hand wash and take the lid apart now and then
Skip it if you…
- want a dishwasher-safe mug
- want fast, free-flowing sips from a wide opening
- prefer a larger tumbler for ice and cold drinks all day
The Zojirushi SM-SF48 is a 16 oz (0.48 L) stainless steel vacuum insulated mug with a flip-open, locking lid. The maker lists the body as vacuum insulated stainless steel with BPA-free plastic parts and says the stopper comes apart for thorough cleaning.
The mug is old in design terms, so there is plenty of tester history. A few of the tests we found covered close relatives rather than this exact model, and we flag that below.
What owners say, at a glance
Bars show our editorial summary of how consistently owners praise or complain about each area across all sources — not a lab measurement.
The key specs
| Capacity | 16 oz (0.48 L) |
|---|---|
| Body | Vacuum insulated stainless steel |
| Lid | Flip-open with safety lock, vent on the mouthpiece |
| Maker's heat test | 189 F after 1 hour and 160 F after 6 hours, starting at 203 F |
| Maker's cold test | 46 F after 6 hours, starting at 40 F |
| Cleaning | Stopper disassembles; dishwasher use is not stated by the maker, and reviewers hand wash |
What owners and testers love
What owners complain about
How it holds up over time
We did not find a rigorous multi-year durability test of this exact model. The design is stainless steel with removable gaskets, and no sources we read reported insulation failures, but the evidence is thin on years of daily use. Gaskets are the part most likely to wear, so reseat them carefully after washing.
Tips from owners and testers
- Preheat the mug with hot water for a minute before filling to squeeze out more hours.
- Take the lid apart regularly, including both gaskets, and let the pieces dry fully.
- Do not rely on a dishwasher, as the maker does not state dishwasher safety.
- Close the lock before dropping it in a bag.
Pros and cons
What owners love
- Among the longest heat retention in tests
- Lid locks and resisted leaks when inverted in a comparison
- One-handed operation
- Lid disassembles for cleaning
- Holds cold drinks well too
What owners complain about
- Hand washing recommended
- Small gaskets can be fiddly to reseat
- Slow flow rate
- Tall, narrow shape tips more easily
Other options owners compare
These are the insulated drinkware options most often compared with the Zojirushi.
| Model | Style | Consider it if… | |
|---|---|---|---|
| Zojirushi SM-SF48 (this review) | Insulated travel mug, locking lid | You want maximum heat retention and a secure lid | See on Amazon |
| Yeti Rambler 20 oz Tumbler Read our review | Insulated tumbler, wide mouth | You want a bigger, rugged tumbler for hot or cold drinks | See on Amazon |
| Thermos Stainless King travel mug | Insulated travel mug | You want a mainstream option that was strong in leak tests but kept coffee hot for roughly half as long in Consumer Reports testing | See on Amazon |
Want hot coffee that stays hot all morning?
Check current colors, sizes and availability on Amazon.
Frequently asked questions
How long does the Zojirushi mug keep drinks hot?
Consumer Reports found a 16 oz Zojirushi kept liquid hot for about thirteen and a half hours. The maker lists 160 F after 6 hours from a 203 F start.
Is it leakproof?
The maker says the lid prevents spills and has a safety lock. A separate comparison saw no leaks when shaken, tipped or inverted.
Can it go in the dishwasher?
The maker's product page does not state dishwasher safety, and reviewers hand wash it.
Does it work for iced drinks?
Yes. The maker lists cold retention, and one comparison found it the coldest at 24 hours.
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Sources we analyzed
- Consumer Reports via KOMO: top tested insulated travel cups — heat retention comparison with Thermos Stainless King
- Zojirushi: Stainless Mug SM-SF48/60 — specs, lid design, maker's heat and cold figures
- Prudent Reviews: travel bottle and mug comparison — leak test, flow rate, cleaning notes (may cover a related Zojirushi model)
- Saveur: One Good Find, stainless steel travel mug — older hands-on impression, hand washing
- ShopSavvy: Zojirushi mug review summary — pros, hand wash drawback
Figures reflect each source as of October 20, 2026 and may change. We summarize owner feedback in our own words and do not reproduce retailer reviews.